Debian :: Unable To Access Ntfs Partition?

I recently formated my harddrive and instead of theld fat32 partition for windows partition I used ntfs. I am mounting this partition in /media/windows in debian linux. But it shows a cross (x) symbol above the folder and says I don't have the permission to access it. the permission on the folder is (drwx_ _ _ _ _ _ ) and it is owned by root. So I changed it to my user name -- sid by doing the followingsudo chown -R sid:sid /media/windowsHere are my questions1) Now it allows me to access the folders but all the files like pdf or photos have a cross on right top corner and it says access denied. Is this because of ntfs since with fat32 I didn't have this problem.

2) Also I have a /data (ext4) partiton which is a common partition for datafiles between Ubuntu and Debian. It has the permission -- drwxr_xr_x . I am trying to write to this partition and save files but it doesnot allow me to do it. do I have to make chmod 777 to do that?3) How do I make sure that both windows and /data partition are writable right from the beginning at the boot time.